I've seen tons of amphorae, which are provenanced as having been imported (with wine). Though presumably, since these are generally quite large, they had a fixed seal for a lid, and were transported via carts?

There's also the drinking horn found in the Hochdorf burial, but without some sort of closure it seems more like a drinking vessel and not one to transport drink.

I've also got some images of wooden tankards/mugs from Iron Age Britain, but once again no obvious means of closure.

Of course potential items such as "wineskin" and various animal bladders don't hold up well in the archaeological record.

If its got to be portable then a skin would be the best bet - there are rare barrels from the archaeological record but even a small barrel (technically probably not a barrel as the name reflects the amount it holds) could be awkward to carry.